Banana fiddler crabs put on a delightful display to attract females, waving one big claw and drumming on the ground. Researchers studying fiddler crabs say this helps show potential mates how strong they are and the size of their home – the better the drumming, the bigger the burrow.In a study published in the journal Royal Society Open Science, researchers note that the male banana fiddler crab (Uca mjoebergi) is “well known” for its repetitive claw-waving during courtship. But in addition – and when the female approaches – they switch from waving to rapidly rubbing their claw together to create a ‘drumming’ vibrational signal.